So Jim you're saying that if I run a 12v 20 watt bulb with 6v I'll get 5W output? That's terrible.
Man I just bought this lamp. It's one of these but I got it with the NiMh battery.
http://www.cygolite.com/light/products/8ExplorerNiCad.htm
I'm just gonna bite it when the time comes to replace the bulb. It's not gonna happen for years to come anyway. By that time, maybe HID technology will be more affordable.